MCQ Questions and Answers on Theory of Machines

Q.

In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal tension Tc. What is the condition for transmission of maximum power?

A. T = Tc

B. T =√3Tc

C. T = 2Tc

D. T = 3Tc

Discuss

Answer : Option:- D

Explanation :

Condition for transmission of maximum power:
T = 3Tc

Q.

For spur with gear ratio greater than one, the interference is most likely to occur near the

A. Pitch point

B. Point of beginning of contact

C. Point of end of contact

D. Root of the tooth

Discuss

Answer : Option:- B

Explanation :

For spur with gear ratio greater than one, that is, the addendum of the wheel is more than a limit, the tip of the wheel tooth will be in contact with a portion of the non-involute profile of the pinion tooth. This takes place at the beginning of the contact.

Q.

Balancing of a rigid rotor can be achieved by appropriately balancing masses in

A. A single plane

B. Two planes

C. Three planes

D. Four planes

Discuss

Answer : Option:- B

Explanation :

Balancing of a rigid rotor can be achieved by appropriately balancing masses in two planes.

Q.

For an involute gear with pressure angle φ, the ratio of pitch circle radius to base circle radius is

A. Sin φ

B. Cos φ

C. Sec φ

D. Tan φ

Discuss

Answer : Option:- C

Explanation :

Let r be the pitch circle radius and r' be the base circle radius,\nr' = r.cosφ\ni.e. r/r' = 1/cosφ = secφ\n

Q.

In involute gears, the pressure angle is

A. Dependent on the size of teeth

B. Dependent on the size of gears

C. Always constant

D. Always variable

Discuss

Answer : Option:- C

Explanation :

In involute gears, the pressure angle is always constant, which is the angle between center line and tangent to base circles

Q.

Which one of the following is true for involute gears?

A. Interference is inherently absent

B. Variation in center distance of shafts increases radial force

C. A convex flank is always in contact with concave flank

D. Pressure angle is constant throughout the teeth engagement

Discuss

Answer : Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

A. Tip of the gear and flank of pinion

B. Tip of the pinion and flank of gear

C. Flanks of both gear and pinion

D. Tips of both gear and pinion

Discuss

Answer : Option:- A

Explanation :

There will be inference between the tip of gear wheel tooth and flank of pinion.

Q.

The work surface above the pitch surface of the gear tooth is termed as

A. Addendum

B. Dedendum

C. Flank

D. Face

Discuss

Answer : Option:- A

Explanation :

The work surface above the pitch surface of the gear tooth is termed as addendum.

Q.

In a simple gear train, if the number of idler gears is odd, then the direction of motion of driven gear will

A. Be same as that of the driving gear

B. Be opposite to that of the driving gear

C. Depend upon the number of teeth on the driving gear

D. Depend upon the total number of teeth on all gears of the train

Discuss

Answer : Option:- B

Explanation :

The idler gears are used to reverse the direction of rotation of gears. Odd number of idler gears will give opposite direction of driving gear.

Q.

When two spur gears having involute profiles on their teeth engagement, the line of action is tangential to the

A. Pitch circles

B. Dedendum circles

C. Addendum circles

D. Base circles

Discuss

Answer : Option:- D

Explanation :

For gears with involute profile, line of action is tangential to the base circles of the gears

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MCQ Questions and Answers on Theory of Machines

Q. In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal tension Tc. What is the condition for transmission of maximum power?

Q. For spur with gear ratio greater than one, the interference is most likely to occur near the

Q. Balancing of a rigid rotor can be achieved by appropriately balancing masses in

Q. For an involute gear with pressure angle φ, the ratio of pitch circle radius to base circle radius is

Q. In involute gears, the pressure angle is

Q. Which one of the following is true for involute gears?

Q. An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Q. The work surface above the pitch surface of the gear tooth is termed as

Q. In a simple gear train, if the number of idler gears is odd, then the direction of motion of driven gear will

Q. When two spur gears having involute profiles on their teeth engagement, the line of action is tangential to the

Q.

In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal tension Tc. What is the condition for transmission of maximum power?

Q.

For spur with gear ratio greater than one, the interference is most likely to occur near the

Q.

Balancing of a rigid rotor can be achieved by appropriately balancing masses in

Q.

For an involute gear with pressure angle φ, the ratio of pitch circle radius to base circle radius is

Q.

In involute gears, the pressure angle is

Q.

Which one of the following is true for involute gears?

Q.

An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Q.

The work surface above the pitch surface of the gear tooth is termed as

Q.

In a simple gear train, if the number of idler gears is odd, then the direction of motion of driven gear will

Q.

When two spur gears having involute profiles on their teeth engagement, the line of action is tangential to the